But it's bs, I'm sorry. There's a reason nobody trusts door to door sales people. There's reason they target the elderly. There's a reason why they have a book-rack of sales techniques. There's a reason they're pushy and persistent and chameleons. And they get a significant paycheque for no actual service to the client.
I work from home with my father in law who's a curmudgeony grouch, yet once a week I have to leave a work call as I overhear them penetrating his defences. And then three weeks later there's an article in the local newspaper about X number of elderly scammed by door to door salespeople selling driveway repeir or duct cleaning or solar panels or roof replacement or whatever.
There is NO alignment of interest between you and the door to door salesperson. They have one goal and one goal only and that is making the sale. Nothing else is real, they're not your new buddy, and they will not be there for you after you sign.
(source - various ; I've been a home owner, have had family scammed, read a lot, and oh yeah, was a poor immigrant and went for several trainings to be door to door sales person and saw the insides of the machine)