ᐅ Drilling into granite columns. What is the correct method?

Hello,

We are currently planning a privacy fence along our property boundary.
For the posts, we want to have 15x15 cm (6x6 inch) granite posts installed by a landscaper.
We plan to install the privacy panels ourselves.
I’m a bit confused. On the internet, there are conflicting recommendations on how to drill into granite. Of course, you need the right drill bit for it, that’s clear. But on one hand, some say you need a rotary hammer with enough impact force to drill into granite. On the other hand, others say you should definitely not use the hammer function. So, which is it?
Does anyone here have advice?

Good luck
Chris

Without a rotary hammer, this is a very strenuous task. For 15cm x 15cm (6 inches x 6 inches), I also see few problems. I would drill the holes before installing the columns.

I drilled my granite only with the rotary hammer, had no problems.

Bosch GBH 18V-26F + the 7 drill bits from Bosch