Ramps, pillars and foundations

Hi. Just a quick question. I’m trying to build a base that is basically grief-safe, and I came up with the idea of placing a ramp instead of stairs and then slamming a pillar in the middle of it. I’ve seen this done before, but just now as I placed the ramp I can’t place the pillar in the middle. Do I have to place the pillar first? Or does this only work with wooden structures?

Only with wood, and yes you have to place the pillar first.