https://www.eufy.com/uk/products/t87b1011?variant=4875830860...

I've been using one of these with Find My for over a year. I've not done anything with the Eufy app, just the Find My app itself. It lacks the precision find, but you can play a sound through the Find My app / get directions / share the item / flag the item as lost / do left behind and it works well.