You cannot add "Cisco Catalyst 9200L - Network Essentials - switch - L3 - 24 x 10/100/1000 (PoE+) + 4 x Gigabit SFP (uplink) - rack-mountable - PoE+ (740 W)" to the basket because the product is out of stock.
Cisco C9300L-STACK-KIT= StackWise Switch Stacking Kit for Catalyst 9300L Series