This adapter must have a USB-C power input, HDMI output, and USB-C connector to attach to the Switch. With a USB-C power input, you can connect your Switch to a charger you don’t drain your battery while docked!
Fortunately, USB-C and HDMI cables run pretty cheap and are available at almost any retailer.
You could use a book to prop your Switch up from the desk. The air vents are on the bottom, so you can even hang it off the side of a table.
Your Switch should charge while it’s connected like this! If your adapter has a USB 2 or 3 port, you might be able to plug in a controller. [1] X Research source
USB-C power input HDMI output USB-C output
Yes, you can use AirPlay on iPhone, or cast with Chromecast, but none of these features are built-in on the Switch so you need to purchase the items in the crowd-funded campaign to stream without wires.