I contacted S.M.S.L about the poor three foot design of the SU-9. They asked me to contact the dealer I bought it from (SHENZHEN Audio) and have them request extras be sent to me. I did so, and SHENZHEN shipped 8 extra factory feet to me at no charge. I had them 8 days later.
Since I only need 2 feet (I added them to the single foot on the rear of the DAC) and will keep 2 as spares, I have 4 available. If you live in the U.S. and need a couple, shoot me a PM and I'll mail them to you free of charge.
You are a delightful person! I wish you many, many years of absolute health and happiness!
(I'm not an American, thank you for the offer of help! And the legs will be useful to someone else, thank you for your kind heart!)