First off, I want to say this is a great concept. All startups either hate sales or need more sales, so it sounds like your business fits for both categories. I have some experience with door-to-door sales teams and cold calling for 2 different startups. The few comments I have are similar to other discussions but still need to be addressed:
1) Sales Team - Who is your sales team? What is their background? When I was on the door-to-door sales team I was working along side a lot of college students that were not motivated. This was a huge let down to the owners who paid for the sales team. Be upfront with your customers on who will be contacting their potential customers. As a startup founder I do not want my name/brand to be tainted in the industry as a company forcing outsourced sales team to pressure my customers into buying my product (this is an extreme case but does happen).
2) Channel - It sounds like you are cold-calling only, if this is the case then do not include "door to door" and "feet on the street" in your title if you are not going to be talking to potential customers in person. My recommendation would to have packages for cold-calling and a separate package for door-to-door sales. This may be beneficial for businesses to have the option and would be a great upsell for SalesInvaders!
3) Customers - It sounds like you are trying to cover most small business as a target customer. My recommendation is to specialize in one industry. This will allow your team to get better at coming up with pitches for the same industry while understanding your target customer. Also, your chances for getting other clients in the industry will increase when you can tell them that you got X amount of sales for another company in that same industry. This is a crucial selling point, as you would know since your in the business of sales.
Good luck with the idea!