I am of the drill the hole ilk.
My best performing antenna is the one that is currently connected to the hard mount NMO mount.

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I have several antennas up and have tested several mounts. I have always had the best performance even when magnet mounting antennas in the same location.

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I have had more water leaks with magnet or lip mounts than the through the roof mounts.
This mount has a smaller diameter section that limits this water leakage problem.

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I will eventually drill another hole for the other antenna I just havent had the time to go out and buy the mount and connector.
My primary radio is a Kenwood TM-D700A It is mounted under the passenger seat and the remote head is located on the center console I have a remote speaker mounted above the rear view mirror.

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