Good security isn’t cheap and cheap security isn’t good. Price is definitely not everything and should not solely be the basis of who you engage.
Do your homework before going to tender and make it an Invitation Only Tender.
Does the Security provider have a proven track record with similar business to yours?
No Security company will get it right 100% of the time so don’t expect it and don’t believe them if they tell you they do. Choose someone you can work with openly and ...