I had really good luck with these: https://www.amazon.com/gp/aw/d/B01FDAET80?psc=1&ref=ppx_pop_mob_b_asin_title&th=1

I bought 4 packs of them for displays at work, ended up going with a something else. So I took the led strips and put two on the front and back ceiling of each shelf so my figure got lit front and back. Looks really good. Snaked them up the sides of the display so they aren’t very visible.

If you check my profile you can find some photos in my posting history. Edit: here is an example: https://www.reddit.com/r/hottoys/comments/hkuo1z/im_not_too_late_for_the_mondo_batman_party_am_i/