Hi Model 57,
Thanks for your reply.
You are correct, you will see the heads of the provided stainless steel flat head mounting screws.
You can see our detailed mounting instructions at our website by selecting the How to.. link and then select the Install from the drop down list, or by clicking on the following link :
http://www.ultimatepedals.com/install.htm
Please let us know if you have any other questions.