Moducase makes a 1:6 display case, the clearance dimensions in the case are L20.47” D16.93″ H17.32″ and it comes with LED lights already built in plus it's air tight so no dust. The only issue would be for statues like Darkseid which is 20" tall but I think the majority of TH statues would fit inside, just depends on which ones you were collecting. If you were getting Darkseid they do make a module that attaches that is L20.47” D16.93″ H36.61″
https://us.moducase.xyz/sixth55-disp...d17-71-h19-29/
https://us.moducase.xyz/sixth98-disp...d17-71-h38-58/
EDIT: I just measured some of TH status and Supergirl and Martian Manhunter are both almost 18" tall due to their poses and Superman with his tall base is 17.75" tall... but all the 66' Batman statues would fit no problem
The taller case does come with an option shelf so you could put Darkseid on the bottom and some smaller TH statues above him.