The A&H QuPac series is a good combination for that what you want. QuPac has also a display to manipulate a single channel - or it could be controlled via tablet software. It has submixes, returns, records to usb stick or SSD. Sound quality is top. You can possible score a used one for around 1k.
I have one of those, because of the smaller footprint - it does not have wifi included, only a ethernet interface - so you would have to connect it to the LAN to control it via wifi.
I did choose it because of the smaller footprint, desk space is limited for me - it could also be rack mounted, the usb driver is very stable - so you could also use send fx from a laptop if you want to.
You could als mix and mash which channels via usb streaming - also for fx send /return.
Dont have a Valhalla stomp box - send it via usb, return via usb. The included fx are also usable, and it has parametric EQ, and compression per channel. The mono channels could also be linked if you wanted more stereo.
I personally try to record as much mono as possible, as it makes mixing easier. Also there are noise gates - so you have clean channels if there is no input - so noise does not build up.
There are a lot of threads about it: