Alignment without histology image

Hi,

Thank you for your great work! 

I have some questions after reading your paper and SpatialMETA tutorials though: 

1. Is it possible to align ST and SM slices **without histology image**?  Would you mind providing a **tutorial**?
2. Do you think SpatialMETA will work on other omics, like **ATAC (peak matrix)** and **RNA (gene expression matrix)** slices alignment? 