Imo its about getting it maybe max 10cm closer to wall. In my case even this 10cm made quite a difference because i can't really move my chair further away.
Also I'm using some pretty cheap (like 20€) digitus wall mount. https://www.amazon.com/Digitus-90357-Universal-Bracket-42-Inches-200-Black/dp/B01HOCIZTO
Just used some 100cm long dowels to attach it to my concrete wall. No problems at all.