Your setup will mostly depend on what you are trying to achieve with the H90, there is no “best” way to do it.

You could use the H90 between the Mooer and the mixing board to replace your other pedals and it will work great. I would suggest doing it that way if you want to keep it simple and have your rig work the same as it did before.

There are other options to use the Mooer as an H90 insert, this is shown in the Mooer user manual here: https://www.mooeraudio.com/product/Cab-X2–245.html

You can follow these instructions on the H90 to set that up: https://cdn.eventideaudio.com/manuals/h90/1.8.6/content/setup/one-stereo-insert.html

Let me know if that helps.