From what I have gathered so far, it seems that Altars need 4 blocks high inside a structure with a ceiling.
I have read that Altars need to be 8 spaces apart on the horizontal.
I have also read that Altars need to be 16 spaces apart vertically.
Is this information correct?
If anyone has any tips for placing multiple Altars in a multi floor Tower type structure, it would be appreciated.
Thanks in advance.