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Using a diamond grinding disc make a flat and level area about 300mm, mark out the pier base plate and the holes, drill the first hole to suit Ramset 'TruBolt' of at least T12100 size, you need a 12mm masonry bit and you need to drill 100mm deep plus the thickness of your base plate.
Once you have the first hole drilled install your pier (which should have 15mm holes drilled in it to allow for installation. Drill your second etc holes through the holes in the pier base as otherwise the drill will want to wander about in natural rock. After each hole is drilled install that TruBolt and then drill the next one...
(that's how i would do it..... )
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