Inserting print-ready PDF's into Indesign Magazine

I have a script for Show Options https://indesignsecrets.com/script-show-options-files.php

Once you have selected your image frame in InDesign -run the script and choose the option you require.

You can also just remove the crop marks using Acrobat. That is what I do.

If the crop marks have been added in Acrobat's Advanced section of the Print dialog window then they will only appear when printed. If you then import a file that has been saved with trim marks turned on (in Acrobat) into InDesign the trim marks will not be there and you can insert the pdfs into graphic frames on the InDesign pages. If the crops were added manually in InDesign or Illustrator prior to making the pdfs then they will appear and you may have the problem of aligning the crops in InDesign. If the page sizes of the pdf ads match your InDesign pages then it might be best to export the InDesign (with crops and bleed) to a print ready pdf and then insert the pdf ad pages into that pdf.

In each case, I would just Place the PDF in the InDesign layout and use the frame to crop out unwanted bleed and/or marks. In cases where the bleed is applicable, you should still be able to crop out the marks and leave enough bleed (unless they set the marks at 0 offset).