Let Me Explain To You Why It's Not Z.Z. Rot Portal.
An apostrophe, though mostly used to indicate ownership or form a conjunction in English, also can denote a glottal stop, usually when transliterating from another language that makes use of them into English text. A glottal stop is generally a consonant is pronounced absent any vowel sound. When you say "Z. Z. Rot" like you say Z. Z. Top, you're actually not pronouncing the letters, you're naming them. A Z doesn't actually have a long E sound when it's used in a word. It's inconsistent to spell out two letters of a word and then pronounce the rest of it normally, but that's what you're doing when you say Z. Z. Rot.
TL:DR It's something like zrot, or zuhrot. Either works. Zuhrot is probably a decent Anglicization, so go with that. Just stop spelling it like a bunch of old bearded men are going to come out of it and play a song.