Stack the two ovens.

I googled microwave organizing stand

COSWE 2-Tier Metal Microwave Oven Rack Shelf Unit, Kitchen Utility Storage Shelf Organizer for Roaster Oven etc -White https://www.amazon.com/dp/B07YPVMB2T/

This one will give you a shelf above the top oven

AbocoFur Expandable and Height Adjustable Microwave Oven Rack, 3-Tier Metal Kitchen Counter Toaster and Rice Cooker Stand, Heavy Duty Tableware Storage Shelf with 3 Hooks, 15.7"-25.2"(L), Black https://www.amazon.com/dp/B08XW9JGP7/

This one creates two shelves above a single oven

SITAKE Microwave Stand, 2-Tier Multifunctional Microwave Ovens Countertop, Stainless Steel Fine Mesh Silver Kitchen Shelf https://www.amazon.com/dp/B08B7Z7MN6/

This one has adjustability

Expandable Microwave Oven Rack, 3 Tier Kitchen Countertop Storage Extension Shelf Free Standing Extendable Adjustable Toaster Organizer HAOYIXMS Metal Baker Workstation Shelving Retractable Racks https://www.amazon.com/dp/B093SQKYZK/

Then there’s the idea of a drawer under a microwave. Not as useful bec the counter must be clear to open it, but since the door has to be anyway… This one has a shrimpy door, but you get the picture

Mind Reader Under Microwave Storage Drawer Heavy Duty, Mulit-Purpose Stand, White https://www.amazon.com/dp/B089WGSR1D/

A pair of these might work side by side.

SimpleHouseware Stackable Cabinet Basket Drawer Organizer, Bronze https://www.amazon.com/dp/B072YSNBP1/