Indeed the 9000XL is only manufactured for the rear of your F150. Strange; haven't seen that before simply a rear only application by Rancho.
I'm still not tracking on you ride height needs.
Is your truck lifted (lift kit installed)? If not, you do not need a "ride height adjustment" shock. If your truck is lifted, simply purchase Bilstein 5100 standard shocks designed with the lift parameters for your lift kit.
Shocks, do not add "lift" to a F150 (or any truck for that matter), coil and leaf springs provide the lift and are designed and manufactured to provide a predetermined amount of lift.
The Bilstein 5100 with ride height adjustment is simply a shock that allows the owner to fine tune and level the front of the truck with the rear, not add lift as with a lift kit.
When you look at the Fox Shox spec for their 2.0....
...and you see the spec: Lift: 0 - 1"...
does not mean the shock is going to lift the truck up to 1". But, rather, this shock is suitable for applications with OEM suspension components (0" lift) and/or any after market components that have been installed that lift the truck up to 1" over factory height.
For discussion sake, lets say a truck has a 2" lift kit installed, this shock will not work in that application due to insufficient travel and OAL too short. One can still install this shock on a 2" lifted truck. However in very short order, the internals will be destroyed and the shock blown out due to insufficient travel...a very costly mistake with Fox components.
If I'm missing the intent of your questions, I apologize.
I've lifted a lot of trucks since my first Toy back in 1975.
I sold my 2003 F-250SD this past summer. I installed a 2.5" Old Man Emu lift kit and Ranch 9000XL on all 4 corners.
Before I installed the Rancho shocks, I installed Bilstein 5100s designed for 2 - 2.75" of lift. The Rancho 9000XL performed much better than the Bilstein's with this application due to the compression and rebound adjustment feature.