If it's a genuine P1 splitter mate you will have this stamp in the centre of the splitter
and this stamp adjacent to the towing eye
If you cant see both stamps, it's not a genuine P1 splitter.
As mentioned by Worzel bolts are better than glue.
I have grounded out many times in car parks etc and we have fabricated 4 brackets.
It's rock solid now and never moves when scraping the underside on the odd occasion.