How to implement cheap advertising via wifi today?

Question

WiFi

Hello. I read a lot of information about this. Everything is either old, or expensive, or one point. Maybe there are new ways?
We have many restaurants in the city and each has its own wi-fi point. Each restaurant distributes its Internet through a router to which either a telephone or lan wire is directly connected. I mean, it doesn't even smell like computers. There was an idea to pay restaurateurs to place their ads on their wifi networks. Now a question. How to advertise in each restaurant? It can be an ad block at the top of the page, it can be an advertising banner for 15 seconds. I understand that you will need to put your own mini computer in each restaurant, which will broadcast ads on the network. I just don’t know what exactly (mini pc) to buy. Or can it be done in some other way? Maybe in the last year something cheap has entered the market. Tell me please.

Answer 1

usually an authorization portal is made in a wi-fi network with built-in advertising. look towards the implementation of the network / advertising in the Moscow metro

Answer 2

Contact the local provider, consult with the local system administrators.