Good evening. I recently removed the trunk lip NMO mounts off of my BMW and purchased a set of permanent installation NMO mounts. There will be two antennas, one of which will be a Larsen 2/70 dual band and the other a Larsen 5db gain 800mhz antenna for my Uniden scanner. Looking at the structure of the trunk I provided a picture of where I would drill the holes to keep it symmetrical. I was told that the hamiltonian needs about 20 in all around and the circles in yellow is a secondary option. I am trying to avoid the second option so just looking for opinions on what the performance it will be on both compared to a roof install which I will not do. Yellow measurements are 20-18-10 Thank you.