As long as there are water in the line, The pump can be several feet above the water tank.
This is not as important if you have an Aquamist system. The system automatically turn off the system and activate the failsafe if the water level goes below the level sensor for more than 20 seconds. This will not allow the system to run empty and needs re-priming. A fully baffled tank also improves the risk of air entering the system. Real pain to get rid of without re-priming.
The Aquatec pump is not fully hermetically sealed from factory. There are no less than seven locations where water can enter the pump and kills the bearings (see image below).
The solenoid valve should be in the engine bay (aquamist), as close to the jets are possible.
I don't believe you have an aquamist system?