Since you're testing on download, the queue should be applied on LAN interface.
set interfaces ethernet eth1 traffic-policy out Limit_DBox
Since it's a download policy, you should filter on destination address, not source.
The sum of all bandwidth percentages should be 100% or less, so set default bandwidth % to lower value
These commands will show what queues are build, and if traffic is hitting them:
sudo tc -s qdisc show dev <LAN-INTERFACE> sudo tc -s class show dev <LAN-INTERFACE> sudo tc -s filter show dev <LAN-INTERFACE>
