You can slave rating * 3 devices to a comlink, RCC or cyberdeck. You can order devices from your PAN. A RCC makes it easier to control drones, but from my reading of the rules anyone can control a drone (using its internal pilot program) from a simple comlink. By my reading, you can still give orders to devices slaved to your PAN so.
Fairlight Caliban ($8,000) + 4 Nixdorf Sekretar ($16,000). The Caliban runs a browser app while the agent from each Sekretar performs an aid another action on a matrix information test. Result + 6 dice - 1/2 time.
Fairlight Caliban ($8,000+ 21 Nixdorf Sekretar ($84,000). The same idea but instead you run 7 clusters of 3 agents. The first agent in each cluster makes a gather information search, The other two use aid another. This means each cluster is running Agent Attribute (3) + Agent Skill (3) + Aid Another Bonus (3 [on average]) or 9 dice on a gather information search.
Cyberdeck with Level 6 agent + 3 Nixdorf Sekretar's per agent. In this case each agent program runs Agent Attribute 6 + Agent Skill 6 + Aid Another bonus 6 (on average) dice to gather information.
Attack Dog (Clearly Rules Legal), Nixdof Sekretar + Level 2 Attack Dongle ($16,000). Probably best used to aid another in cybercombat.
Cyberdeck + 10 Attack dogs ($160,000). A swarm of agents isn't exactly subtle, but gets the job done.
Sleaze Dog (Clearly Rules Legal), Nexdorf Sekretar + Level 2 Sleaze Dongle ($16,000). Probably not all that useful for the don't get seen aspects of sleaze, but handy for cracking files and hack on the fly.
Upgraded Dog (might not be rules legal). Transys Avalon + Program Module + Level 6 Agent ($17,900). Assuming an average of 4 successes you would want a level 4 dongle ($65,900 total).
Upgraded Firewall. Fairlight Caliban + Program Module + level 6 agent ($30,900). A fairlight Caliban running a agent with orders to perform matrix overwatch (matrix perception tests) and perform the full matrix defense action if the device is attacked. 12 dice (Rating 6 attribute + rating 6 willpower) + applicable device rating (most likely firewall) or 19 dice to resist most matrix attacks without the character needing to spend an action.
Plus B&E ($78,900), the same as Upgraded firewall but with a level 4 sleaze dongle giving 10 dice to resist matrix perception when running silently.
Extra Cheese, any of the above plus a machine sprite running diagnostics on the central device.
Possible rules issues: The ruling that a device persona merges with your person when in VR might cause the device chain to drop. I would think that you would still be able to set up an agent swarm around a comlink then access it through the control device action.
Fun extra: You know agents are so good at one of the primary tasks of computing (finding information) that corporate bigwigs are going to want to run with whatever allows them to control the most agents. Could be some interesting flavor if the characters break into a stock brokerage and everyone is running either high end cyberdecks or RCCs to max out on the number of agents they can control.
Suggested house rule: limited the max number of agents that a character can control to either their Computer or Leadership scores.