You're best served forward mount a red dot NOT inline w/ irons and then mount the magnifier on rear cover.
Something like this:

Railed top covers will put your magnifier as low as possible. I do currently have a ramlite magnetic railed top cover for sale over in the classifieds that would serve you well for mounting a magnifier:
https://czfirearms.us/index.php?topic=110643.0For offhand shooting it held a fairly exact repeatable zero w/ a red dot.
But for any not inline with factory irons option, I'd highly recommend going with RS Regulate's Magpul Yugo stock adapter or one of the various AR stock adapters that sits a little higher than the OE ones do for best cheek weld. Suppose the FAB with cheek risers would work too.