Banners are a good way to advertise your need and make a good presentation. They should be well designed and need to be placed well to have a good result. I do know a team that assist me in many my of projects (for now I don’t have any projects) has some good
banner advertising techniques and a well established network to make it count on your needs. I believe they can provide you good solutions for your work as they are professionals at their work.
All The Best.