The flow rate in a closed loop is the same in any location. The same amount of water that the Pump moves flows back into the reservoir. You only need 1 flow sensor.
Flow sensors from Aquacomputer requires 5cm of straight tube before and after the sensor to measure correct values. Dont use 90° fittings near the sensor.
2 temperature sensors are enough. One sensor in the hot water (behind a cooler), and one sensor in the cool water (behind a radiator).
Thanks for the help! If I use this EK 50mm extension fitting on each side, will that work?
EK-AF Extender 50mm M-F G1/4 - Black – EK Webshop (ekwb.com)
Is the 5cm also required for the newer high flow NEXT and high flow 2 sensors?