Hi Andy,
I am controlling one or two blinds. In the beginning I had both of them 'linked' to one single remote command, but later I dissociated the two blinds because it was not comfortable for us to act on both of the at the same time, because one is n a bedroom and the other in a main room.
I use the KUX100 remote command, it is easy and possible to control more than one blind with it. I don't know how far you can go away from the receiver, but they are RF and in my little house I can go at least 15 meters from the receiving box: in my case there is a receiving box with a cable going to the blind, so I have a bit more flexibility for placement of the receiver.
These remotes ares sold for an outrageous price by Velux, but I was lucky to find a spare one for 20€, otherwise I would not have been able to do this trick.
In your case, don't you get one remote for each blind ? with 11 blinds you probably do no want to have them move simultaneously, you will have to do different groups I would guess.