When we added a suite in our basement, we installed a rain head shower in the ceiling and a hand-held on a vertical rail so it can adjust for different heights. They have separate on/off controls but a single temperature mixer. Two people can definitely shower together in this scenario and the hand-held is invaluable for cleaning.

How about a fixed shower-head, a rain shower, and a hand shower placed low and near the bench? Depending on the water rules in your area, you could have 1 valve and a diverter to control all 3. Or you could put the shower head and rain on one valve and diverter, and have the hand shower by the bench be on it’s own valve.

We have a hand shower situated right by our bench. It’s great.

Showers where you have a choice of hand held or overhead is one thing - but when you can run multiple heads at the same time you get into something else.

Be aware of the codes in your state. This won't fly in California, for example.

Know that multi-head showers that run at the same time SOUND like a cool idea, but the novelty wears off fast.

You have to design for it - including your water heater, drain, water lines, etc.

The OP, or the GC on the project, just has to make sure to be compliant to the water rules in their area. A hand-shower by the bench gets my vote. Please delete the shower-head that looks like it will be shooting towards the shower door. If you don’t want a rain shower, just do the fixed showerhead and a hand-shower near the bench. You can have 1 valve and a 3- way diverter.

Thanks everyone, your feedback is very helpful. I'll leave the one shower head that is pointed toward the bench and have a handheld on the adjacent wall.

Where is your valve going to be placed?

I suggest the South East area in your drawing, in a pony wall, and have your shower door be able to open inward and outward. You can turn the water on to warm up before you get in without getting wet. And the pony wall provides a little privacy for the person sitting there.