@pr4bh4sh it is just simple as you will add only tmp parameter your appium command.
appium -p 6000 --nodeconfig /Users/testinium/iphone6.json -U SDFD43523SDF --tmp /tmp/iphone6
appium -p 7000 --nodeconfig /Users/testinium/iphone5c.json -U RG435G4J6535 --tmp /tmp/iphone5c