Mine were located in the same area on my 222 CCP (opposite the end of the flush mount rail).
I realize neither model is yours but it gives you some perspective on the factory idea of location. Remember, the 250 CCP is your hull.
I've searched through our members 250 XF pics but can't find one that had the outrigger mounts.
Looking at your gunnel, I would guess you would mount them behind the last post on the bow rail (and just forward of what appears to be a fill (fresh water) on the starboard side. Plenty of space on the port side. You may need to install some form of access plate to facilitate mounting (through bolting) if you desired.
Good luck.
PS... how's old girl running?