4 stroke wire trimmer concerns

Hi there!

I'm looking to buy a string trimmer to reach the difficult spots in my garden, i do have 1 concern, i know the differences between a 2-stroke and a 4-stroke, but I'm still a bit confused on the 4-stroke,

While i heard that 4 strokes are better in terms of power and pollution, i also heard that you can't turn a 4-stroke on it's side ( because of the oil ) and also because the manual of my lawnmower also says to not mow on a large incline ( due to the oil in the crankcase )

This may sound stupid, do keep in mind that I'm just a kid trying to maintain his garden :)

Do these "lawnmower" rules also apply to the string trimmer? or am i able to turn it on it's side?

to, for example, trim the sides of my lawn ( the unreachable spots for a lawnmower ) in wich i would have to turn it on its side ( 90° )

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thanks in advance

( i'm talking about the HONDA 4-stroke string trimmers )