do I need Zeus if I do not have an own LN NODE (cannot provide 24/7 internet connection)

or is Phoenix enough?

what would make Zeus better?

if I download Zeus, can I just instantly start receiving (buying LN sats on an ATM and receiving into Zeus)

can I connect my nostr/ primal for zaps with Zeus?

(am here since quite some time but never had LN, cuz I thought to have an own LN NODE or no LN at all^^)