Two of weeks ago I installed a Energetic 3D 3Dmax-PEI magnetic build plate on my Monoprice I3 Plus printer. It is a thousand time better than my previous glass setup. To install I trimmed the corners of the magnetic panel prior to gluing to the heated bed, I later purchased 4 3 x 25 mm flathead screws and drilled a taper in the heated plate to flush mount the panel.
I find it necessary to use hairspray to get good adhesion. It washes off with alcohol.
A really nice feature is the plate easily lifts off the bed and with a small flex the part pops off. Definitely going to get a couple more.
I also purchased another brand with a different type of removable magnetic plate. Have not tried it yet. It will attach to the current magnetic base, just need to adjust the height.
While I was at it I 3D printed some adjustment knobs that use 3mm nuts with the nylon lock. Two weeks without adjusting the bed!!!