Primarily, LOOK FOR LOCATIONS! Once you find them, you can decide if you want to pull your machine from the oil shop or if it is doing well enough to keep it there and just buy more machines for your new locations. Now some locations may be so fed up with their existing vendor that they want you in there Yesterday or will find someone else; but most will allow you a week or two to get your machines in.
We've had several vendors use alarms on their machines and in 90% of the cases it has stopped it as long as the management is willing to punish those that are caught. In some cases, the manager is not concerned and the alarm is not as helpful. If your location's manager is just one of the boys, forget it; but if you can talk to him and share your concerns seeing that he is also upset, the alarms will work.