I think those are actually 87º but most often referred to as 90º stems. I had a pair on my previous bike and liked them.
But when I got the FOBO units I ordered a pair of their T-valves so I can fill the tire without removing the sensor:
This shows the 8mm stem but an 11.3mm version is available for the ST and other bikes.
https://my-fobo.com/Product/FOBOACCS
They also sell a short metal stem that's looks to be 13-4mm tall (from rim to top of stem).
I'm running the rubber stems until the next tire change. Maybe I'll put a little duct tape or Surgu around them to dampen vibration until then.