I don't think there are any rules for positioning. Use your aesthetic judgement.

trademark would be used to distinguish one brand from the other, as opposed to service mark is used to distinguish the provider of different services.

this website below from the us gov might answer some other questions.

http://www.uspto.gov/web/offices/tac/tmfaq.htm#DefineServiceMark

Thanks for the info.
For some reason i thought this thread was never posted due to web error..sorry about the late reply.