These multi-part models by Lost Kingdom Miniatures are designed to fit on 50x60mm oval bases, or 40x60 rectangular bases.  The slavers are designed to fit on 25mm round bases, or 25x25mm square bases.
 
We do a decent removal of all of the supports from the printing process that we can without spending too much time, but we recommend you doing your own inspection of the models for anything that we missed.
 
We do not provide bases with any any of our prints, unless a full decorative base is part of the print.