The process to install a new network site isn't an application process as such, but there's a few factors that may affect your best course of action.
Is your company a customer of EE? If so, the business-CS route may be the best - https://business.ee.co.uk/business-solutions/connectivity/indoor-coverage/
if not, then an interested landlord will often be approached as part of the search process for new site locations. Are you in a position to represent the landowner? Out of interest, where (roughly) are you?
