As stated "Measure twice" from a point that is straight and your switches will be straight.
Leave enough room between the switches so you don't trip two at once.
Those switches look like they are the lighted type, so if you don't use lighted switches how will you remember that they are on (if needed)?
My only problem in the location is my knees hit the dash once in a while (broken switches), long legs I guess. Look for a location that is convenient for you not what only looks good.
I have seen an X with the vent by the driver side door replaced with switches. I want to say three or four switches but I do not remember. Determine how many switches you need and look for a space that fit the switches.
Also, if you screw up on measuring or drilling, an alternative to using a piece of plastic, is a small piece of aluminum to cover the area of the switches. Also, another piece behind the area you drilled would help support the switches.
Of course there are always overhead switches!
Good Luck,
beavis195
Look s good !