Sometimes doing the right mount means getting the right rig. I am not familiar with the rigs you plan to install but when I decided to install a mobile rig in my truck, I studied my options before buying the rig and made my decision on what fits best. In my case, it was two rigs: HF Transceiver and VHF/UHF FM Transceiver.
I figured my favored configuration was to use my cup holder (between the seats) and a cup holder radio mount. Since I can see the entire range of the console unit between the two front seats, not sure if this method applies. Here is a photo of the kind of mount:
Indeed, that is an Icom 706 in the image which is the HF radio I ended up getting because of the removable head piece (like shown).
My VHF/UHF rig is the Yaesu FT-7800R (no longer available new) and it would share the same space but no mounted, it just laid around some place convenient (such as the storage box between the seats) since I never had to look at it and could use the mic buttons to switch memory cells of favored frequencies.
What I liked about my solution is that absolutely no holes in plastic parts (see below, some holes drilled) and nothing permanent placed anywhere up front -- not even sticky tape. Only one cord for each radio followed under the carpet to the rear seat of my pickup truck (crew cab so extra space) and the main base unit of each radio sat under the seat with access to antennas and power -- nothing visible or in the way of any other activity.
The photo below shows under the rear seat of the crew cab extension on my Chevy Silverado (2004) pickup truck. This particular photo only shows the base unit for the Icom 706 but the Yaesu is about the same size and sits right next to it.
In the photo you can see my power distribution boxes from cables that run from the battery in the front of the truck, through the firewall (an opening already existed there) and then under and along side the main frame of the truck and then up through the floor to the distribution boxes which support fuses. Since this photo was taken (about 7 years ago) I have installed a fused West Mountain Radio Anderson Power Pole distribution box making it more convenient to add and remove equipment.
By the way, there to the lower right of the distribution box is a UHF extender about 2 inches long that goes through the floor of the cab and provides for PL-259 adapter hookup under and in the truck for the main HF antenna coax.