Pitching a mid on hard ground

Anyone have any advice on how I should pitch my mid on rock?
Looking to set up a base camp for a week or so on a big flat granite rock, there's no spots for pegs at all. How secure would guylines and rocks be?
I don't have a free standing tent nor do I want to purchase one.
Cheers
Looking to set up a base camp for a week or so on a big flat granite rock, there's no spots for pegs at all. How secure would guylines and rocks be?
I don't have a free standing tent nor do I want to purchase one.
Cheers