Wow, that's all?
To answer your question;
Salvini cichlids get between 6 and 9 inches (15 and 23 cm.) They're known to be very territorial which isn't good for most species. However, as with all aggressive fish, it CAN be done.
(I should mention: I don't have experience with this species or with large, territorial cichlids, however I know this from fellow cichlid lovers or research I've done over the years.)
I suggest other large, aggressive cichlids if you have the space - red devils and jack dempseys, for example! I love their personable natures! A few smaller cichlids such as convicts or firemouths are good too. They may be small, but their territorial and feisty! Armoured catfish are an obvious choice, too; medium to fairly large plecos like rubberlip I would go for, or even large
cories like anaeus, brochus, etc as they're large, fast, and peaceful but covered in tough armor. Other catfish like a pictus, raphael, eclipse, or butterfly might work too although I can't say for sure. Chinese algae eaters are promising too! One time, I fostered a pair. They were adopted by a dude with a 250G, large cichlids, bala, and red tail shark. Reminds me...rainbow, red tail, or bala sharks may work! They're territorial, and balas can be aggressive. Bichirs, peacock eels, or even dojo loaches are a great option too! Everyone says dojo loaches are peaceful, but not for me...they ATTACK and KILL goldfish! A group of tiger barbs could work too.
Overall I think tankmates with your species can be done, but a great deal of caution and care is needed to keep the tankmates (and cichlids) in good shape. Keep a hospital tank and meds on hand at all times, just in case it goes foul.
Hope this helps! Good luck with your cichlids
TL;DR red devil, jack dempsey, convict, firemouth, rubber lipped pleco, anaeus/brochis cory, eclipse, pictus, raphael, or butterfly catfish, chinese algae eater, bala/rainbow/red tail shark, bichir, peacock eel, dojo loach, tiger barbs