You cannot add "Cisco Catalyst 9300 - Network Essentials - switch - L3 - Managed - 24 x 10/100/1000 (UPOE) - rack-mountable - UPOE (830 W)" to the basket because the product is out of stock.
Cisco Small Business SF350-24MP – Switch – L3 – Managed – 24 x 10/100 (PoE+) + 2 x combo Gigabit Ethernet/Gigabit SFP + 2 x Gigabit SFP – rack-mountable – PoE+ (375 W)