OH my lord I just sat here typing a whole answer to you and it tried to tell me I wasn't logged in when I was and now its gone. I didn't say I used 3 heat matts I said to build 3 walls around the outside to hold in the heat almost acting as if it was on the bottom. I have a infrared gun and at full capacity that glass were the matt is reaches about 88f so I don't think any frogs are getting burned on there. I also have sprayed the glass directly were the matt is and nothing ever happens, I actually tested it out one night on full and nothing. I took the frog out don't worry and if it broke I didn't really care because that would be a great excuse to buy another tank. I personally think this part of the husbandry is really what the keeper prefers. The one thing I will point out about the matts is you always want to go up one size from what your tank is when placing on the side. Im not trying to say your wrong or start an argument I just think that both ways can be an efficient way of heating your tank. Well that and you asked for opinions so I thought I would share mine. And one more thing if you are going to use this and want others to use it as a care guide you may want to be a little more specific about the temps. Mid to high Celsius during the day then let it drop into the lower Celsius at night I imagine a lot of people will be a little confused to what exact temp they should have. From what I understand and again im just sharing the knowledge I have learned because you asked for opinions is around 82f during the day is ideal and an adult can stay in temps in a range of 85f but the 82f mark would be better even for the adult. Night temps can go to around 75f but around the 77f would be a more ideal temp. This part was actually recommended by my exotic vet, but I have read it in other places also.