Mounting the Vortex SPARC Solar Red Dot Sight on to the Zastava Arms USA M70 Scope Mount you should be able to co-witness your front sight.
The Zastava Arms USA M70 Scope Mount should work with the M90.
Yes, the Zastava Arms USA M70 Scope Mount will be compatible with your N-PAP M70 rifle.
The Zastava Arms USA M70 Scope Mount will not mount to a ZPAP92 that has a picatinny dust cover. The picatinny rail will prevent it from mounting properly. I recommend using another dust cover then using the Zastava Arms USA M70 Scope Mount.
The Zastava Arms USA M70 Scope Mount is designed for Zastava/Yugo pattern AK receivers. It will not fit a KR-103. I would recommend using the Midwest Industries AK 47/74 Generation 2 Picatinny Rail Quick Detach Modular AK Scope Mount, found by using the link below:
https://www.opticsplanet.com/midwest-industries-ak-47-74-generation-2-picatinny-rail-quick-detach-modular-ak.html
The Zastava Arms USA M70 Scope Mount should work fine with the PSA AK-47 GF3.
The Zastava Arms USA M70 Scope Mount should work fine with a side folding stock. The manufacturer does not state any compatibility concerns with any stock and the Zastava Arms USA M70 Scope Mount.
The Zastava Arms USA M70 Scope Mount should mount to the side receiver mount on the PSL-54. However, due to the many differences between AK variants fitment cannot be guaranteed.
If you mounted a non magnified red dot to the Zastava Arms USA M70 Scope Mount you could co-witness it with the front iron sight.
Yes, the Zastava Arms USA M70 Scope Mount will mount to the side receiver rail on the Zastava M90.