I have the Verna white colour, bought it a week ago and the first thing I wanted to do is put alloys. I didn't have budget for 16 inch tyre and alloys so I decided to go for the 15 inch alloys with the stock tyres. It was difficult to find 4 holes 100 PCD alloys but finally found 4-5 of them and I tried putting one of them. The problem is - Verna comes with 5.5/6J rims/alloys and all after market alloys are 6.5J which is 1 inch wider and once I put those alloys, the tyres were popping out a good half/1 inch out of the fender. It was looking ugly and I put back my old wheel caps and rims which is 15 inches 5.5J. Sad to mention, I had to pay 3k to not take the alloys after they had fitted it - bad day.
So, you will need to be very careful while choosing alloys. If the rim is 6.5J which is beyond Hyundai's specification then you will need a positive offset so that the tyre sits inside the fender and you don't have issues with body touching the tyres.
Considering 15 inch stock rims comes with 5.5J rims with center offset or zero offset which means from the point where the bolt is put, the tyre will protrude 5.5/2 = 2.75 inches from the bolt on point (this will keep the tyre inside the fender)
Now we want to put 15 inch after market alloys which is always around 6.5J so if the offset is zero then the tyre will protrude 3.25 inches from the bolt on position which is 0.5 inches more and this is what happened with my after market alloys. The front fender is too small to accommodate that extra half inch, so, to fit the 6.5J alloys, you will need positive offset so that the tyre goes inside the fender and the suspensions work perfectly without hitting the body. To compensate for that extra 0.5 inches, an alloy with offset of around 12.7 millimetres will balance it. Plati has alloys with 30, 35 and 42 offset. As per my calculation the 30mm one should fit the Verna perfectly. One more thing we need to check after fitting it is to check the steering wheel movement completely towards the dead left and right. That way we are sure that the tyre is not touching the suspension or any internal parts.
If the Hyundai tyres are not center or zero offset then the calculation will change accordingly.
Also, many people are going for broader tyres but they are not understanding the rim width plays a major role here. The stock 195/55 tyres are extremely broad and it should look really fat but the problem is the width of the stock alloys which is 6J. If you remove the tyres from the alloys, you will notice how wide the tyre is but as the width is 6J for the alloys, the tyre gets curved and the full flat surface is not seen and it looks narrow. If you fit the same 195/55 tyre on a 7J alloys, you will notice how fat it would look. So, people who are upgrading to broader tyres, it won't make much difference because the stock rims are only 6 inches wider and the tyre can't go beyond 6 inch width. If you force it on that rim then it will get curved and won't give you the fat look. If the tyre is curved, I would not suggest to go for such upgrades.
There are lot of technical aspects to it which must be seen in detail before fixing and after market parts. The people selling it don't have so much knowledge about offset or width, they will advice you to go for anything that has 4 holes and 100 PCD or multi hole (very ugly) even if it doesn't fit correctly. Spend your money wisely, I realized it only when I was looted by 3K