Lay-z
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pretty much mate, ive always seen holes cut through surfacing about 9 by 9 inch roughly and i think minimum depth of about 14 inches, 4*4 post sunk into the hole, concrete poured in arround it, the post is squared up in all directions and then the cement is packed down arround the post....might need to put some stays in to hold it in place temp whilst the concrete sets (be ok next day)
you could also use post spikes, not sure if they are used with cement or are an alternate fixing...somone will advice
then its left a day, and mount your panels in, using weather proof fixings ofcourse!
and then make good the surface
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