Hi Sharon,
The National Rebound Therapy Consultancy provide recommendations as to how and where trampolines should be sited.
If you have completed a genuine Rebound Therapy training course, have a look through your course information material. You will also find there a very good paper written by the CSP which gives clear, sensible advice.
If you don't have this information to hand, contact Rebound Therapy dot Org and we will be pleased to provide you with the information.
Paul Kaye