Not sure which mounts you bought, but the original mounts for the 87A were a side mount configuration. A quick Google images search will net you a plethora of photos you can use as reference for various types of scope mounts.
https://www.google.com/search?q=%22S...h=941&biw=1920
I would presume you could D&T most anywhere so long as it doesn't interfere with any bolt function components (extractor or ejector, sear, etc). Biggest thing is making sure the screws don't protrude into the inner bore of the receiver when installed to prevent any interference issues.
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