How to safely power a large LED strip project
Canada uses 120V outlets. The amperage of the circuit is typically 15 or 20 amps. But that is at 120V. 12V 5A is provided after the power supply regulates the input down. Without taking into account efficiency, 12V 5A is the same power as 120V 0.5 Amps, or 60 Watts. Add in efficiency costs as no power supply is perfect, it's likely 0.6A input. Look at the label on your supply and it will tell you what the input amperage is. That's the amperage you need to worry about on your power strip/outlet/circuit.
If this is on a small localized display, you should consider using a 200 to 240 Watt 12V supply, like maybe a PC power supply. Less issues with multiple supplies.