I was looking for info on setting up standoffs for reflow solder, but I didn’t really find anything. One interesting thing that I found, you can solder surface-mount standoffs directly to your board, and there is high-temperature tape that you can use for securing components during reflow soldering, called Kapton tape.
20200817/DuckDuckGo pcb reflow standoffs
20200817/https://www.digikey.com/en/product-highlight/k/keystone/surface-mount-threaded-standoffs
20200817/DuckDuckGo Kapton tape
20200817/https://www.uline.com/Product/Detail/S-11730/High-Temperature-Tape/Kapton-Tape-1-Mil-1-x-36-yds
ANother interesting and informative article I’ve found, common causes of reflow soldering defects. Good thing I haven’t yet seen any of these issues in my experience of reflow soldering, but my solder paste is still pretty fresh.
20200817/https://resources.altium.com/p/common-smt-process-defects-to-avoid-during-soldering