Anyone can help evaluate if this is fair price?

Scope :
1x new Cassette 2hp - brand new position ~25 feet away?
1x existing wall mount 2hp - moved position to behind existing wall + higher position
2x existing wall mount 1hp moved a little bit higher from existing position.

Reason for moving to higher position is because we redid the plaster ceiling, Previous owner installed the wall mount units at 2.1 m from floor height which we thought was too low.. But rough estimation shows moving it up costs ~RM450 from quotation - sounds much higher than what you all have posted up there.. So am considering does the extrinsic value justify the spend.. And whether I was quoted too much?

Here is the quotation breakdown provided (excluding aircon unit cost)
Rm2600 - supply and install copper pipe
Rm1000 - installation for wall mounted (2x 1hp, 1x 2hp)
Rm475 - installation of ceiling cassette
RM500 - Hacking

Total RM4575

Appreciate any sifus can comment?