The smartest system for securing your shoulder strap, but poor tightening on the end caps with the clips. It should be nuts on threads.
You must apply yourself with good tools because you have to drill in your instrument, be careful and protect as much as possible around the place of the drilling.
The price is exaggeratedly high. But if you want flush mounting, there is only that to be found on the market, even in China!
Then, if you forget your shoulder strap, there will be nothing to replace it to hang your guitar on your neck!
The button may be too exposed and could be released by bumping an amplifier edge for example, to be tested.