You can manually create a subnet scanning by IP 10.1.70.1 - 10.5.70.254 All printer subnet
But if there are other devices that are configured for IP's within the ranges you have inbetween the printer subnets....well, see below:
You may need to create multiple scanning subnets instead of trying to do an all in one.
Like 10.1.70.2 - 10.1.70. 25 - printer subnet location 1.
Like 10.5.70.2 - 10.5.70. 25 - printer subnet location 2.
and since they are printers, they dont move so you can scan off hours.