Is this 4 gang available in white?

Yes, please search this ASIN B072JZLL84 in the search bar.

Do the double sockets with USB come with a spacer?

No these don't come with a spacer. If you look at the link below we have some side on photo's which show the profile. There is a transparent gasket fitted but that is to protect the metal front plate from any moisture which may exist in new plaster. https://www.amazon.co.uk/gp/product/B07JBBLT8S/ref=ask_ql_qh_dp_hza?th=1

Do you need very flat plaster for this to look good? I was told to avoid very thin plates but not go too thick either. Is this make a good balance?

The profile. Is very slim so no it wouldn't look great on a rough finish

Screwless dual voltage shaver socket? does a standard back box work with these?

The Technical information in the description for the dual voltage shaver socket has the following "Fits into a back box with minimum depth 47mm" so you need a backbone at least this depth. See for example and

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Description

⚡ Elevate Your Grooming Game with Style!

CERTIFIED SAFETY - Complies with EN 61558 standards for peace of mind.
STYLISH DURABLE - Crafted from high-quality steel with a stunning matt black finish.
UPGRADE YOUR SPACE - Transform your bathroom with a sleek, modern touch.
VERSATILE CHARGING - Perfect for electric shavers and toothbrushes, keeping you powered up.
EFFORTLESS INSTALLATION - Fits seamlessly into a back box with a minimum depth of 47mm.

The Knightsbridge SF8900MB Screwless Dual Voltage Shaver Socket in Matt Black is a stylish and practical addition to any bathroom. With dual voltage capabilities (115/230V) and a sleek screwless design, it offers both functionality and aesthetic appeal. Certified to EN 61558, this socket ensures safe charging for your electric shavers and toothbrushes, all while maintaining a low profile that fits perfectly into a minimum 47mm mounting box.

Specifications

Manufacturer	Knightsbridge
Part Number	SF8900MB
Product Dimensions	14.85 x 4.75 x 0.5 cm; 720 g
Item model number	SF8900MB
Size	5.0 mm148.5 mm47.5 mm
Colour	Black / Black
Style	Shaver Socket
Finish	Matt Black
Material	Steel
Shape	Rectangular
Power Source	AC
Voltage	230 Volts
Installation method	Fits into a back box with minimum depth 47mm
Item Package Quantity	1
Plug profile	Wall Mount
Usage	Charge electric shavers or electric toothbrushes
Included Components	Screwless 115V/230V Dual Voltage Shaver Socket - Matt Black
Batteries included?	No
Batteries Required?	No
Item Weight	720 g

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