Then, you should not enable DHCP on MAAS. If you follow that blog you are actually setting up your home router to do all the job.
You should just setup your home router to avoid using the x.0.1 - x.0.254 addresses (because MAAS will use them to assign a static ip to your machines) and in MAAS you should setup the reserved range from x.1.1 to x.1.254.
If you want to understand a bit better what you are doing, you can watch Show and Tell: Using external DHCP with MAAS