Sit me up - Question

Does anyone have pics of their baby sat in a sit me up?

My daughter is in a harness for hip dysplasia and I need to keep her legs as flat as possible so a bumbo is a big no-go for us but now she’s 3 months she’s constantly wanting to be sat upright.

I was looking at the sit me ups but the pics online don’t show me well enough how low to the ground it lets them sit so I can keep her legs in that kind of diamond shape she needs to be in. Ie the pic below, it looks as though the baby is raised off the ground slightly or is that just the pic?