You need to decide what you are going to do before you choose a drain---
I don't know what is used for Hot Mop----so ask a local plumber or a California member---
For a hand packed shower base with a PVC liner--you need a clamping type drain --covers come in round or square----cost about $35 with a square drain cover---much less with the round---
If you are using Ditra you need a Schluter drain---over $100---
If you are using Hydroban by Latacrete--you could use a Schluter drain or the new drain from Latacrete---never saw a price on one yet--new product---
Here is a link on a lined shower---How to build a shower - Building a shower pan with pre-sloped mortar
bed, liner and curb.