Power conditioner/strip

I do have the amplifier plugged directly into wall.  

Why?

It depends on amplifier, power conditioner and the wall current. There is no universal right or wrong. Also may depend on particular power cords. 

Puritan Audio PSM-156 might be worth a look.  They come up used, so I waited for one near me and got it less than half of new price ($3,500 USD) with their "Ultimate PC" included.  I think it checks all you boxes with 6 outputs that are spaced enough for big plugs.  Well within budget (used) and should be a good step up from current.  If you care about Reviews, Steve Huff dubbed the PSM-156 the best power conditioner ever regardless of price FWIW.  

I have many like this wk many in the south with out power unplug all your electric equipment audio computer ect. There will be fluctuations in power.because the wind blows here in idaho alot the power glitches. I can't afford to plug my expensive amps directly into the wall. They may sound better that way but a dead amp due to power irregularities sucks. I have had good luck with furman 20 I because it has > 60 amps for transients in my amps.the same engineered left furman went to audioquest and developed thier 7000 model that also has great reserve. I use > 1kw amps and don't have power limitations with these products.im sure there are other products that don't limit curent. Upscale audio has a video on this watch it. Stay warm and healthy.enjoy the music.