We used the Iltis is RHQ RECCE when we were not in the Lynx, there was never a mount, we just added sandbags with the ground mount (bi pod) on it. Some used the "dog leg" from the Lynx C & R mounted on a pole.
The only true RECCE Iltis was in 2002, when in Kandahar the Iltis was fitted with a Coyote Ack Ack mount, fitted with a C6 GPMG.
Anthony