Altair layer chart, force x axis and y axis + ticks to be all together

Question

I have a bunch of dataframes that I don't want to merge because they have the same column names, I want them in different series.

So, I make separate charts and put them in a layerchart together at the end.

Sometimes though, the data is such that the chart changes, the x axis will be on the top or bottom, y axis on the left or right, different offsets, different x and y domains. This makes the final layerchart have a ton of axes and it looks horrible. How can I force them to all use one unified axis? resolve_scale='shared' makes them scaled to the same domain and range, but still leaves behind all the copies.

Edit: I've tried resolve_axis() too. I'm confused, it seems like it's forcing independent axes.