Not that i can see. I can select all of my objects but cant see how to move them all down by exactly 11.133301 in the z axis in respect to their initial position.
if you put -11.133301 in the transform box it moves everything to the location -11.133301 not the origional location minus that amount.
Hm, there are 2 options,
Take each model per hand, take the location of the Z you wanna change, put it in for each and its done.
Sadly you cant take serveral models and just type in the change, but you can set up and … a visual clue where your wished for hight is, and than select all models and move them to the hight you want to have them.