After 4 years of my phone flying around whenever having a little fun, I finally followed arpad_m's lead and got the same holders... Just like he did, I removed all the crappy double sided tape they put on them and added 100% coverage of some good velcro hooks with really good adhesive on the back...
Once they are in, they really look EOM... and they hold on tight...
About $15 total including a huge roll of Velcro...
The holders ($7.19 with a discount code for 10% off):
https://www.amazon.com/dp/B07GXL2KZT...t_details&th=1
The velcro I bought (the adhesive seems really strong) ($7.59 and I have a bunch left):
https://www.amazon.com/g