What is the opinion of Reddit about the
Philips BG105/10 Body Groom with Skin Protector Guards?

Philips BG105 is what I used. It’s a bit more expensive now and not in stock, but it used to cost 17€. No ingrown hairs, pretty short trim, no cuts.

You could also just move a bit, open the cheeks a bit if you are sitting, when you feel it coming. Not a big deal