The Beogram 4500 could be wall-mounted, but only horizontal.
The Beomaster 4500, Beocord 4500 and Beogram CD 4500 could be mounted vertical.
The 3500 system is similar, but had black / grey finish and didn't have 2 way-communication.
(the 4500 system was white on the front and sides and had mirror panels),
The Beosystem 3300 could also be wall-mounted, Beomaster 3300 and Beocord 3300 vertical,
the Beogram 3300 and Beogram CD 3300 horizontal.