Those trendy rear screens won't work with Pixels, because Google

4 hours ago

Google Pixel devices do not support magnetically attaching wireless displays due to lack of Miracast support.
Miracast is an open protocol for wireless video casting, which Google dropped to promote its own Cast protocol.
This limitation also prevents Pixel devices from connecting to Samsung or LG TVs that support Miracast but not Chromecast.
Secondary screens on phones are trending, but Pixel users cannot utilize these accessories.
Google's last device to support Miracast was the Nexus 5; no Pixel devices officially support it.
Pixel's Screen Cast is incompatible with TVs that only support Miracast or AirPlay, requiring external Chromecast devices.

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