#2 Would 2 of the 250 mm pole extension be ok to use for a 10ft ceiling?
You can always adjust other parts of the pole to make it work
#3 I just received my pole today and I am unable to connect my pole to my ceiling base how can I do this?
Yes this answer is correct "There is an extension inside of the pole u have to put the rod that is used to tighten inside of the extension and turn until it fits the ceiling"