Quoted from Oldgoat:
Is there any requirement that the mantis be installed first or can you install it at a later time? Second question, I was surprised to see a piece of mylar the same shape as the protector. Having no experience with Cliffy's, as a general question, is that typical for these types of protectors? I assume installation is simply remove the one post, put down the mylar, put the protector on top of the mylar positioned such that the post screw goes through the hole in the protector, replace the post and viola.
You can install the Mantis later. Installing the Mantis is generally difficult. Also, installing both the Pinbits and the Mantis is a bit overkill. If I understand correctly, you also got a mylar shaped to fit under the Pinbits? If so, you are truly overdoing it by installing a Pinbits over a mylar and with a Mantis. This will be the first time I've heard of someone installing two forms of protection, never mind three, in one place.
Mylar is generally for flat areas to help prevent wear from a ball repeatedly rolling over the flat area, such as between the pop bumpers. Mylar is not generally used to prevent impact wear at holes, for example. Cliffy and Mantis protectors help prevent impact wear at the edges of wood cutouts.