I used to have a KAC cantilever Aimpoint mount upon which this clone is based. It worked well for me, but I never did see the benefits of mounting an Aimpoint or EOTech further forward than the upper receiver allows.
Further forward or anywhere, most people have their reasons and opinions. When I had the KAC mount there was no magnifier, I used my TA01NSN as a magnifier (never shot with it), then the cantilever mount was useful because it allowed the ACOG to mount behind it.
I like my Aimpoint and EOTech as far forward as the upper receiver allows, but if they were mounted further back, I'd have no problems.
I have an Aimpoint rail grabber without the spacer if you want it, it's fine on my HK weapons, to use it on the AR's receiver you'll need a spacer