On my high voltage bench I am using up to 6 scopes at once from time to time.
All old school Philips / Fluke Combiscopes, switchable between Analog / Digital.
I like how you have them labeled "Scope - 1" to "Scope - 4." In case you forget they are scopes?
Added: Sigh. I counted mine. 23 I think, unless I missed some. Of which *most* don't work.
My workshop development arc still hasn't reached the 'recommission all the old gear' stage. Soon.
Frequent use:
HP 1743A 100MHz, on main desk.
Trio CS-2110 100MHz on other bench.
6 x Tek R7903 & 1 x R7603 are in good condition but haven't been powered on for years and will need babying and repairs. These are mostly in racks, one per rack with other gear.
1 x Tek 7104 (needs repair, had an unfortunate HV discharge accident due to me being stupid/clumsy.)
3 x HP 54120B 20GHz (2 working with sampling heads, 1 mainframe only for spares)
1 x HP 83480A Digital Communications Analyzer. (Its a scope really) 30GHz, optical + electrical. Works, but no plugins. Still looking for one or more cheap plugins for this. Didn't realize the plugins are also compatible with current model HP high end scopes, so the prices are always high.
'For the museum' (Means they look cool, but not much actual use. All these were free scores, could not resist.)
1 Tek R5030 dual beam. Works but needs new bulbs in readouts. Looking for suitable LEDs, not having much luck.)
1 x HP 1201B 100uV dual trace old scope.
1 x Tek 5103N D12 Dual Beam oscilloscope. Nice scope, only 2MHz BW, but huge screen.
2 x Tek 5103N D13 Dual Beam Storage. Working, few minor problems.
1 x BWD 530A. Needs work, can't find manual.
Others
2 wrecks (Tek 464 & 475) picked up free for parts.
1 Tek R7633 storage. Was fine when bought but had a "packed by a moron" shipping injury and needs major rebuild of frame at minimum.
Didn't count video waveform monitors and XY displays.
Edit: 24. I forgot to count a Tek 465 on a trolley. Works, used now and then.