There wasn't even a small pedestal to stand on. And nails were driven into the sides of their ankles; not through their feet. Interesting video to watch: "What was crucifixion like" on YouTube.
I actually asked a biblical scholar about this and apparently it was a cause of fierce debate in the past.
Some said that they wouldn't have had belly buttons because they weren't born but created. Others argued that they would have been created with belly buttons because that's how humans were meant to be and they were templates.
The thing was, I wasn't expecting a serious answer.
So you found the only two contradictory pages of mumbo jumbo in the entire bibble and brought them to light for all of us to share? You are quite the theologian.