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For a stud wall that is just plasterboard , I would recommend these ...I can't wall mount unfortunately as it's a plasterboard wall where my desk is. I was thinking a monitor stand/arm thing but I'm unsure how much space that will get me tbh. From a picture I saw it may even be closer than with the original stand.
(I would also recommend getting the setting tool)
Anchors | Cavity Fixings | Screwfix
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For a "dot and dab" wall , I would recommend getting these ...
Corefix Connect 100 Dot & Dab Wall Fixing 24 Box - Metex
Corefix Connect 100 heavy duty dot & dab wall fixing, easy to install no special tools required, just drill, driver & hammer. Patented system that includes an engineered steel core that bridges the cavity and transfers the load to the blockwork behind. 100mm screw length, 10mm maximum fixture...
metexonline.com
I have fitted a number of heavy objects onto walls and I have had no issues with any of the above.
Before I moved to my current home , I had a 65" Sony Bravia which weighed 40KG approx , fixed to a "dot and dab" wall with 4x Corefix. No issues.