I am a renter and didn't see any spool holders/racks/brackets that could be mounted with command strips instead of screws. So I designed my own. These are designed to use the "medium" 3M Command Strips (tm). I've hung about 1.5kg off just one bracket for a day. I am using a pair to hold two 1kg spools of filament and I'm using 20cm of 8mm threaded rod. If they turn out to fall/pull off I'll redesign them to use the large Command Strips (tm).
ps: Thanks to AristoDesign who's design (https://www.thingiverse.com/thing:2755427) was the inspiration for this bracket.
It's been about a month and one set has been holding an unused 1kg spool of PETG and a slightly used 0.5kg spool of PLA. Both spools are mounted with Ansen Slot inserts (https://www.thingiverse.com/thing:338669) and 608zz bearings. More impressively they've held up to my 2yr old pulling on them and spinning the spools. I suspect the medium Command Strips (tm) will suffice for two 1kg spools.
My settings were:
supports = yes (touching)
brim = yes
speed = 80mm/s
wall thickness = 1.0mm