Would a 20x10x11 be ok or is that too narrowI have those T's and I keep mine in 12x12x12 Exo Terra enclosures... I'm sure there is other enclosures you can use but this is what I personally use. Anything that is 5-10 gallon size would work.
Yes I'll be adding a lot of substrateI'm sure that would be fine more length and width is okay but I wouldn't go more in height because there terrestrial.