Which (wireless) hardware (standard) to automate roller blinds / jalousies and marquee

I have Somfy ILT motors that have “digital control” via ZWave using their ZDMI. I can set the shades to a specific opening level by specifying a percentage, like a dimmer. This is super useful in certain rules and for interacting with them on sitemaps.

Do the Fibaro and the (yes, proprietary) RTS bridge work like that? From what I understand they imitate momentary switches so can only do up, down, and stop.

Dunno about Somfy, but Fibaro FGRM are configurable in a number of ways.
Yes you can drive them to a specified percentage.