One of these powers 4 3B+ and 2 Raspberry 4 boards with USB drives, Z-sticks and other accessories. Great if you're mounting multiple Raspberry DIN boards, but there's really no limit.
Expand Your Power With The Wall Outlet Extender - Surge Protector Featuring 6 AC Outlets, Shelf, 2 USB And USB C Charging Ports - Black
38 Review
2-Pack Power Strip Surge Protector With Wall Mounting Holes - Flat Plug Design, 5FT Cord & Multiple Outlets, Overload Surge Protection For Home And Office Use
15 Review
10Ft Wall Mount Power Strip Surge Protector - 9 Widely Spaced Outlets, Flat Plug Extension Cord With Overload Protection For Home Office.
17 Review
π KMC 6-Outlet Surge Protector with 2 USB Ports: Reliable 980 Joules, 3.4A USB Output in Elegant White
10 Review