Laptop's Usb C supports Usb 3.2 Gen 2 & DisplayPort

The USB3 Data Speed is independent of the Displayport speed, which is what you need to know to decide whether it supports 2x 1440p60.

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In practice, all Notebooks with a common processor that support USB3 10G will support at least HBR2 as their Displayport speed. This speed is enough for 2x1440p60 when you use a straight USB-C to Displayport adapter.

With USB-C Hubs that also have other features, such as further USB3 ports this changes and this speed would no longer be enough (because half is reserved for USB3). If you want to be sure, you want to find out the exact DP capabilities of the device (HBRx speed, DSC support?). If you find a statement from the manufacturer that 5K60 or 8K30 or even 8K60 is possible using the Displayport output, then you can infer higher functionality. If the manufacturer does not tell you anything, better assume the worst (which is commonly HBR2 for devices that already have USB-C).

The exact processor or GPU that is driving the port can tell you what the theoretical maximum is. But non-premium products often stay under the max. capabilities to save on money.

First, if you don't need high speed data, https://www.amazon.com/dp/B085VLPYDR will certainly do. It uses all four high speed lanes for DisplayPort thus enabling two 4k @ 60Hz monitors even and yours use less video bandwidth for sure. For data, the separate USB 2.0 wires are used as there's nothing else left.

If you do , we need to dig in.2560 x 1440 @ 60 Hz requires 5.63 gbit/s, two of those require 11.26gbit/s. https://rog.asus.com/ca-en/laptops/rog-strix/rog-strix-g15-series/ says "the USB 3.1 Type-C™ with DisplayPort™ 1.4" (funnily the specs page omits the version!) and half of DisplayPort 1.3/1.4 uncompressed bandwidth is 12.96gbit/s. So it should be possible to have 5gbps or 10gpbs data on the side if you can find a dock which is a) DP 1.4 compatible b) configures the USB C port to use two lanes for DisplayPort and two lanes for USB data. I'd recommend http://shop.caldigit.com/us/index.php?route=product/product&product_id=201 hopefully at least one of your monitors have HDMI 2.0. Surely one of your monitors have a HDMI input, HDMI 2.0 is not required.