Many species are adept at burrowing and scraping too, so it helps if all fences are dug in to a reasonable depth. Tortoises are highly resourceful and determined creatures. If there's a way, they'll find it. Beware of toxic substances used as wood preservatives. Use safe alternatives and allow materials to 'weather' before use.
Substrates Use an appropriate substrate for the species to be housed.
Desert species will require a sandy, very well drained substrate, while many tropical species prefer moist leaf-litter, moss and crushed orchid bark. Provide all egg-laying females with suitable raised nesting sites. Design Try to make all pens interesting and attractive. The old-style wooden pen on a grass lawn is NOT the way to go . Create an 'island' of interesting vegetation in the middle.