Magnolia 'Little Gem'-easily controlled to te 2.5-3m height range that suits your requirements ben. Will generally form a clipped block of foliage over time though not as dense as the lilly pilly we chatted about. *Could be used as a "pleached" hedge(stripping the trunk of foliage and promoting foliage on the top half of the plant) so that a second tier of plant material can be included underneath for a more dynamic visual aesthetic.
/\ /\ . Magnolia Grandiflora 'Little Gem' or 'Teddy Bear' dwarf varieties make beautiful evergreen hedges. Height: 20-25' but can be kept 13'. Width: 10-15'. Plant 4' apart. During early years, tip prune new growth by half all around individual trees for good structure and dense form in maturity. Once each plant is thick, prune the face and top of hedge as wide or tall as you like, perhaps 2.5' wide by 13' tall. Round the top.