I swear by Simpatch, with or without SkinTac underneath. My current Dexcom sensor is on day 24, and the Simpatch is still holding strong, with just a bit of one edge coming unglued. I'll either trim it off or stick it back down with some fresh SkinTac, and it'll be fine.

I've seen other folks recommend GrifGrips, Skin Grip, and Fixic, which are also on Amazon.

I use skin tac (liquid, not the wipes). I put some on the sensor before applying (being sure not to touch the needle in the center), wait a couple of minutes for the skin tac to dry and become tacky, and then apply the sensor. Then I put a CGM patch on top of it. Works great! This is the patch I use: https://www.amazon.com/gp/product/B07VQ77BZS/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1

I had problems with them coming off too. This method works great though.

Still have to be careful not to bump it, as they'll stop working if you bump them too hard. But, apart from bumping it, I haven't had any problems since I've done this.

Also note that the Libre isn't fully accurate for the first 24 hours. Takes a while to warm up. So I apply the new sensor the day before the old sensor expires, and then try not to scan it. If I happen to accidentally scan the new sensor before its time, I get asked if I want to start a new sensor. I say No. (If you say Yes, it'll discontinue the old sensor. So it's important to say No until you're ready to use it.)