I'd recommend a Behringer Eurorack UB2442FX Pro, (I have 3 of these and they are great, not too expensive, well thought out and very (very) versatile). (https://www.soundonsound.com/reviews/behringer-eurorack-ub2442fx-pro). It will do everything you need (and give you reverb) plus much more if e.g. you want to use it for recording. You can use the 2 monitor sends as Fx sends (they are switchable pre/post fader (Fx sends are usually post fader (fader changes change send level), monitor sends are pre fader (fader changes don't change the send level). You can rack mount these but they have a big (vertical) footprint. (see attached pic of studio rig)
However, if you want a rackmount mixer, while there are a few (1 RU) options they tend to lack enough FX sends. I'm yet to spot one that has enough sends for the kit I have.
If you can find a Yamaha AM802 in reasonable condition (this is what I have in my live rack) it will work for you (but they are not rack mountable) You can mount them on a rack shelf, I have mine velcroed to the bottom of my rack (see attached pic, it at the bottom of the rack, I have MP2 and MB1 in this rig, you could go MP2 and MP1
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