There are 3 kinds of visitors to your website: visitors using their company Wi-Fi, known visitors using an ISP, and unknown visitors using an ISP. RTP handles all three of these cases differently, and they are explained below.
Visitors on Company Wi-Fi
The visitor's company is recognized by the company's IP address
Their visitor information, such as company name, industry, location, etc. is determined by the company who they are registered under
Known Visitor on ISP
Visitors are recognized by a previous form fill-out
RTP will override the ISP name and identify the visitor by their company name and email address
RTP does not override the location of known ISP visitors
Unknown Visitor on ISP
The visitor will be shown as coming from an ISP, such as AT&T, Comcast Cable, etc.
His geo-location will be shown as the ISP's data center
The location accuracy for ISPs is 95%, though state and city accuracy is less reliable as ISP tend to use proxies
Since it's impossible to identify the company that these visitors come from, you can decide to exclude ISP visitors from seeing campaigns.
While RTP can't identify the company, it is still possible to target these visitors by their online behavior (search terms, referrals, page visits, etc.