How to install GApps on FydeTab Duo running AOSP 12 using OpenGApps/nikGApps

So im going to get a FydeTab Duo to install AOSP 12 on but i need GApps and help,Please assist.Should i use APKMirror for non-core parts?im a beginner so i need help.do i add GApps on the folder i have in the image?