Electronics Engineer here.

The way I've read the zoning laws, you can certainly rent out a SF in print and electronic media, so perhaps that the legal way at this point. 

Administration is a pain, even with just a few devices.

If they have to scroll on a mobile device, you failed.I can let you know about a good company to help w/ this if you want.You can send them all at once if you use a service to mail merge.Hope that helps!

This includes solicitation of donations by or on behalf of charitable organizations;"The grey area comes in the fact you are "promoting a service".The only clear-cut exemptions from the DNCR are:  Canadian registered charities;Political parties, riding associations and candidates;Market research polls and surveys;Newspapers of general circulation for the purpose of soliciting subscriptions;Telemarketing calls from organizations with whom the consumer has an existing business relationship are also exempt (a transaction has been executed within the last 18 months);Telemarketers to whom the consumer has granted their expressed consent (written form, electronic form, or recorded verbal permission). 

I obtain the binding signatures electronically, via Adobe EchoSign.

I have some rentals and they all pay electronically so I never get any mail from the rental.  

I am an audio electronics technician (and musician) so I'm always calling my customers to discuss pricing and what repairs their amplifier or guitar needs.  

I am a Django,js,css,html developer and can come up with a solution for converting the site to look pretty on mobile devices.

Most towns wont even allow you to touch their monitoring devices and must be installed my a professional.