I have no experience with the maxrad, but looks like a typical bottom-loaded whip.
Magmounts, over time, will ruin your paint be sure roof & antenna base is completely clean of everything before putting on vehicle. And don't try to push more than the legal amount thru it. Magmounts can burn the paint if you push too much power thru them.
I know you said you didn't want to do it, you should just drill a hole & put a proper NMO mount up there. They are secure, easy to install, look better, and you will have less long term issues (like paint damage from the magmount moving or too much power). Besdies, if you sell the rig, you can just put an NMO cap on the mount making it look nice and clean, and just leave the cable run "Wired for CB Antenna".
There are other options, like a hood mount that bolts under the hood, but allows the hood to be lifted w/o issue. Still, there's some drilling for the mount, but nothing that would reduce resell value.
Don't forget however you end up mounting it (hood, roof, magmount, thru metal, etc) you will have to tune the antenna...