I can do the maths, I get near 90W, but I'm only planning to draw under a quarter of the power supplies (ebay link) rated max of 5V/12V combo (estimated load 30W). I therefore consider my 19V old laptop supply adequate plus a little overhead. Reading the listing I see a power rating of 150-250W, I expect that translates to 150W continuous and 250W peak, but who knows right now. I did debate splicing two old laptop chargers together, but worry although it would work I probably should have some protection circuitry to stop them fighting each other.
Am I an idiot? (I accept that I am idiotically frugal to attempt to use old laptop chargers instead of a dedicated high load supply but the cost to recycling ratio doesn't add up)
I understand to a level of intermediate electronics but always considered that an underpowered supply was only a problem if it was truly unmatched. i.e. you were expecting the device to draw the full load or have a relatively high startup(or intermittent) draw then your supply should match otherwise load dependent. Reading Voltage at what Amperage made me question my sanity and proneness to unnecessary fire risk.
Don't get me wrong, I've always advised to have a suitably matched rating on supply and device or ideally over-rated supply to avoid running hot.
End use devices are various voltage hobby microcontrollers and SATA drives via https://www.amazon.co.uk/gp/aw/d/B07R8S8VTT