On my Mkv, the pole is 33 inches above the deck for use with a symmetrical spinnaker. However, if I want to use it as a whisker pole, it needs to be lower. This would also be the case if you're flying an asym. The Mkv has a movable ring, so its ready for any use.
You'll have to drill holes to mount the fixed ring. Consider drilling a few more and mount a short piece of track on the front of your mast, which will allow a movable ring and more options for you.
MkV #581 FLYING CIRCUS
Silver Gate YC San Diego