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Just so I'm satisfying my own anxiety here, your suggestion is that the weight is ok as long as I use a sturdier fixing, and the one you've linked uses the same size hole, but should support more weight?
Also the "prongs" not being able to grab the plasterboard due to the tiles wasn't an issue for you?
NurseHolliday-
Obviously do your own research on the weight ratings but I have a 60x70 mirrored bathroom cabinet full of stuff on 4 of the M4 ones and it seems absolutely fine. The manufacturer suggests them for shelves and kitchen cabinets so obviously expected to carry a decent amount of weight.
They look like this after tightening up so quite a bit of spread contact compared to the plastic plugs
The prongs are only there to stop it rotating as you tighten it up. If you use the setting tool to start with you can tighten it right up before you start to screw it in.
aggi
With a similar dilemma (bathroom cabinet where there were tiles, plasterboard, big gap) I went with these (actually I think I went with the M4 ones which only required an 8mm hole).
https://www.orbitalfasteners.co.uk/products/m6x52-interset-cavity-fixing-rawl-p-no-r-sm-06052
Lots of different sizes available so you can fine tune them to the substrate thickness and gap.
I also used the setting tool as it made it a bit easier with tiles.
https://www.orbitalfasteners.co.uk/products/interset-cavity-fixing-setting-tool-rawl-pno.-41-545