I decided to go with the FrSky D4R-II as this and the DHT are popular combos. I used PPM (CPPM). To use PPM, bridge the signal connectors on channels 3 & 4 (pictured) with the provided jumper that came with the RX.
Hook the receiver up to your flight controller. Pin 1 on the FrSky to Pin 1 on the controller (Flip32+ in my case). Follow instructions to get it working in PPM.
This is easily done on the Cleanflight configuration page.