I’m so glad we can now use type to siri AND normal siri.
On the mac, you double press the right command-key to bring it up.
On the ipad, you double tap the bottom of the screen.
But … on an iPad Pro, with a Magic Keyboard, you can’t use the trackpad to double tap (or, at least, I couldn’t)
With a little experimentation I discovered that globe-S triggers it.
Hope that helps.