[Ubiquitous]

Hi All,
I am preparing my Lazer ZX-"T" for the indoor season here in Switzerland. I will be running on carpet for the first time. I am super excited!

Since the wheels of my truggy are bigger and have more torque, I expect that the belt will start snapping under heavy breaking. I removed the belt cover and installed a front belt tensioner that I 3D printed. My question is: How do I set the proper belt tension?
I also understand that some use a rear belt tensioner, is it really necessary?
If yes, can anyone share the design?

Thanks!
Ubi