Recommendations on trans tape?

My (30f) boyfriend (31FtM) has started hormone therapy recently but is nowhere near the point of getting his top surgery. He is bothered by the fact that, even with a binder, his chest is still a little noticeable. He hasn’t had good luck with trans tape in the past, but wants to try it again. Does anyone have any recommendations? I’ll be honest and say I know nothing about it, but I want to support him however I can. Thanks in advance!!