With all Double swing openers you will need to install a gate stop. This is so the motors have a positive close position to push against for maximum performance. There is another style available (not shown in photo but does the same job)
The rubber stop we use for swing gates is 40mm high to the top of the catching tongue. This is made up of 15mm for the step for where the concrete bolts go and 30mm for the tongue.
The base is 125 wide x 100mm deep.