Size: under roughly $150k/yr, this isn't a fit yet. Not because you're too small to matter — because these systems make an existing pipe run faster, and if the pipe is empty you'd be paying to speed up nothing. Get lead flow first.
Sweet spot: roughly $250k–$5M/yr, with a real customer list or steady inbound calls.
Trades: cleaning, roofing, plumbing, electrical, HVAC, pest control, lawn and landscaping, pressure washing, restoration, and most home-service work. Commercial contractors specifically for the lead-generation side.
If you're not on that list, ask anyway. The pattern is the same across most service businesses — I'd rather look than guess.