There is a bunch of good info on inserts here: Threaded Inserts: Which ones are best? And why?
Personally I have had issues with the brass inserts breaking during installation and after rough rides. However, I have been very happy with the stainless steel m4 inserts I picked up from Ali Express.
The trick to getting them installed is using two nuts on a bolt set at the right depth and tightened against each other, then you screw the insert on the end with the notch side down. Drill a pilot hole slightly smaller than the insert, add epoxy or glue if necessary and after you install the insert, you can use pliers and a wrench or two sets of needle nose to loosen the nuts. The bolt and nuts come right out and and the inserts remain in the deck. Remember if you use adhesive to keep it out of the inner threads with a tiny bit of painter’s tape or something similar.