What
You should use low profile switches on your rectangle.
- https://splitkb.com/products/kailh-low-profile-choc-switches?variant=47265452425563 I'd recommend the purples from here (Kailh Low Profile Choc Switches Purple). Note: I've tried the pinks and found them to bee too easy to accidentally press.
Why
- decent, but long-winded overview https://www.youtube.com/watch?v=wUWWhkGgTak&t=494s