The best replacement for protection one is adt.

The best alternatives to protection one are rated as following:
★★★★★  adt
★  vivint
★  frontpoint
★  brinks
  monitronics

Your alternative for protection one is not listed? Suggest!
Speaking about protection one, one probably shouldn't forget about esecure.

Other search terms related to protection one and their ratings are:
★★★★★ esecure
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protection one
adt
vivint