Trane quote & setup for upstairs / downstairs

Is this a good setup for upstairs / downstairs in Texas heat and humidity? Is this a decent quote? Appreciate all the constructive feedback.

|| || |||TRANE  SETUP| |||Direct Vent w/ Trane Zoning| |4 Ton System|5TTR50 / 5TXC / S9V2|$ 5,184.| |3 Ton System |5TTR50 / 5TXC / S9V2|$ 4,986.| |2 Plenums $143 ea||$     286.| |Zoning Control|TRANE|$     955.| |Zoning Dampers|EWZ|$  1,200.| |T-stats $250 ea|TRANE Stats|$ 750| |T-Sensor|Trane Sensors|$       35.| |r/A Plenum $95 ea||$    190.| |Emergency D.P. $85 ea||$     170.| |Flue Piping $85 ea||$     170.| |Condenser Pad $158 ea||$     316.| |Total for parts||$14,242.| |TAX - 8.25%||$ 1,175| |Mark Up from Subtotal|35% of $14,242|$ 4,970| |Installation Fee $1,500 ea||$2,500| |Investment ||$22,887.00| | 3% off for cash| |$686.| |Cash in Hand| |$ 22,201.00| ||||