Which frats get to mix with aphi??

Do they only mix with AD, sig chi, sig phi DU? Would they mix with DX or Chi Psi? I’m rushing and I want at least a couple chances to mix with aphi but I’ve heard they’re really picky. If I joined a lower or mid tier frat like chi phi how likely would I be to mix with them? Would they still come to our parties even if we don’t mix? Please give me as much information on this as possible