Vinegar seems to work. A few years ago we had a real fox problem, and I was told human urine is good. Thing is, it smells and seems you need a lot of it. Some vinegar along your perimeter should help. They've hundreds of other gardens to prowl.
If I were you I'd keep the fence heights as they are and see what you can do to repel the foxes. They'll soon learn to go elsewhere if it's too difficult to scale the fence.
Or if your garden has nothing of interest, or something to drive them away.
Asking prices and the sums at which sales are agreed are often very different. Depending upon the agent and the client type and the client's motivations, two identical properties might come to market at very different prices. This particular house might seem expensive but it's got an enfilade (or something) so it must be worth every penny.
https://www.google.com/url?sa=t&source=web&rct=j&opi=89978449&url=https://m.youtube.com/watch%3Fv%3DixNKXmYB4LE&ved=2ahUKEwih962QlcKEAxXCS0EAHbsfBOgQ3yx6BAgOEAI&usg=AOvVaw14TdOT7m7J_g2WAQ5p6mFc
Bang the acid