I think they should have left it SLOR instead of changing the name to SLOE... How do you say that, is it SLOW, or SLOW E... regardless...
Just restating what was said above, the SLOE should ONLY be from an Academic EM Program and preference would be a 'collective' interpretation of your rotation, likely written by the Program Director with you 'eval' written as a sum.
IF there are particular faculty you jive with, I would get a written regular LOR from them. SOME PDs have openly said they 'ignore' anything that is not (was) a SLOR... but I still think there are many people out there that WILL look at them with respect...