The Printed parts need to be glued together you dont need any supports, just a good first layer wich will stick good to your bed.
Use some glue wich is transparent watch this YouTube video if you dont know what glue to use for PLA.
I also highly recommend trying ironing (do a test to see if it works with your 3D Printer) so you dont have to do any nasty sanding. Watch the second video for more infomation about ironing in PrusaSlicer.
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I repaired the files and made them printable. I also included the Modells wich a “Ready to Print” and also the “Raw Modells” without being sliced in the middle.
I used the modells given by a user named justin svendsonjustinosss from Thingiverse.
The author hasn't provided the model origin yet.