Positioning grace note beams at the height of normal note beams
When notes are placed on ledger lines, their beams are usually centred on the stave. Grace notes beams are shorter and grace notes on ledger lines may well have beams outside the stave. You can override this beaming for grace notes.
\relative c { f8[ e] \grace { f8[ e] \override Stem.no-stem-extend = ##f f8[ e] \revert Stem.no-stem-extend } f8[ e] }