my-config/awesome/config/rules.lua

local awful = require('awful')
local ruled = require('ruled')

--- Rules.
-- Rules to apply to new clients.
ruled.client.connect_signal('request::rules', function()
   -- All clients will match this rule.
   ruled.client.append_rule({
      id         = 'global',
      rule       = { },
      properties = {
         focus     = awful.client.focus.filter,
         raise     = true,
         screen    = awful.screen.preferred,
         placement = awful.placement.no_overlap + awful.placement.no_offscreen + awful.placement.centered
      }
   })

    -- Add titlebars to normal clients and dialogs.config
    ruled.client.append_rule({
        id         = 'titlebars',
        rule_any   = { type = { 'normal', 'dialog' } },
        properties = { titlebars_enabled = false     }
    })

    ruled.client.append_rule({
        rule       = { class = 'steam'     },
        properties = { screen = 1, tag = '3: Gaming' }
    })

    ruled.client.append_rule({
        rule       = { class = 'discord'     },
        properties = { screen = 2, tag = '2: Discord' }
    })

    ruled.client.append_rule({
        rule       = { class = 'nekoray'     },
        properties = { screen = 2, tag = '3: VPN' }
    })

    ruled.client.append_rule({
        rule       = { class = 'firefox'     },
        properties = { screen = 2, tag = '1: Web' }
    })
end)